package com.ylt.assistedClass;

import java.util.concurrent.Semaphore;
import java.util.concurrent.TimeUnit;

public class SemaphoreDemo {
    public static void main(String[] args) {
        //线程数量，停车位,限流
        Semaphore semaphore = new Semaphore(3);

        //6辆车
        for (int i = 0; i < 6; i++) {
            new Thread(()->{
                // acquire() 得到车位
                try {
                    semaphore.acquire();
                    System.out.println(Thread.currentThread().getName()+"得到车位");
                    TimeUnit.SECONDS.sleep(2);
                    System.out.println(Thread.currentThread().getName()+"离开车位");
                } catch (InterruptedException e) {
                    throw new RuntimeException(e);
                }finally {
                    semaphore.release();//释放
                }
            },String.valueOf(i)).start();

        }
    }
}
